NGWEPE L.K และ CLINTON AIGBAVBOA. (2017) ENVIRONMENTAL IMPACTS OF BUILDINGS ACROSS THEIR LIFE CYCLE STAGES IN SOUTH AFRICA. ISEC PRESS:ม.ป.ท.NGWEPE L.K และ CLINTON AIGBAVBOA. 2017. ENVIRONMENTAL IMPACTS OF BUILDINGS ACROSS THEIR LIFE CYCLE STAGES IN SOUTH AFRICA. ม.ป.ท.:ISEC PRESS;NGWEPE L.K และ CLINTON AIGBAVBOA. ENVIRONMENTAL IMPACTS OF BUILDINGS ACROSS THEIR LIFE CYCLE STAGES IN SOUTH AFRICA. ม.ป.ท.:ISEC PRESS, 2017. Print.